The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Nov. 09, 1993
Filed:
Apr. 10, 1992
Applicant:
Inventors:
Assignee:
Nippondenso Co., Ltd., Kariya, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
F02M / ;
U.S. Cl.
CPC ...
123518 ; 123520 ;
Abstract
A detecting system for condition of a fuel evaporative emission generated in a fuel tank, includes a pressure sensor and a three-way valve for selectively connecting the pressure sensor to atmosphere and the fuel tank. The pressure sensor is initially communicated with the atmosphere to detect an atmospheric pressure P.sub.a (step 110), and subsequently communicated with the fuel tank to detect an internal pressure P.sub.f of the fuel tank (step 130). Based on the atmospheric pressure P.sub.a and the internal pressure P.sub.f of the fuel tank, an amount EVP of the fuel evaporative emission generated in the fuel tank is derived through a map look-up against a preset map (step 150).